.header-container {
  background-image: url(/img/go-pro-gb54f67837_640.jpg);
}


form {
  display: flex;
  flex-direction: column;
  max-width: 400px;
  margin: 20px auto;
  padding: 20px;
}

.success {
  border: 2px solid rgb(1, 109, 1);
  padding: 20px;
  background-color: rgb(121, 244, 121);
  text-align: center;
  display: none;
}

input:valid + .error {
  display: none;
}

textarea:valid + .error {
  display: none;
}

form label, .submit {
  margin-top: 20px;
  font-size: 24px;
}

form input {
  min-height: 30px;
}

.submit {
  display: inline-block; 
  margin: 20px auto;
  background-color: #000;
  padding: 10px 30px;
}